TABLE 3.

COMPARISON OF FOLLOW-UP AND FELLOW EYE INVOLVEMENT BETWEEN PATIENTS WITH NONARTERITIC ANTERIOR ISCHEMIC OPTIC NEUROPATHY UNDER AGE 50 (NAIONy) AND AGED 50 AND OVER (NAIONo)

VARIABLE	NAIONy N=108	NAIONo N=108	P VALUE
Duration of follow-up (months)			.52*
Mean±SD	23.9 ± 41.0	17.5 ± 29.8
Median (range)	6 (1 – 224)	6 (1 – 196)
Fellow eye involvement
All	46 (43%)	32 (30%)	.047†
6-month KM estimate	19% (95% CI: 12% – 29%)	19% (95% CI: 11% – 30%)
12-month KM estimate	41% (95% CI: 29% – 54%)	33% (95% CI: 22% – 47%)

KM, Kaplan-Meier.

^*Wilcoxon rank sum test.

^†Chi-square test (log-rank test P=.31 for the time to second eye involvement).